US4955671A - Antiskid control device - Google Patents
Antiskid control device Download PDFInfo
- Publication number
- US4955671A US4955671A US07/310,829 US31082989A US4955671A US 4955671 A US4955671 A US 4955671A US 31082989 A US31082989 A US 31082989A US 4955671 A US4955671 A US 4955671A
- Authority
- US
- United States
- Prior art keywords
- wheel speed
- wheel
- detecting means
- malfunction
- predetermined
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/88—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
- B60T8/885—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means using electrical circuitry
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
- B60T2270/416—Wheel speed sensor failure
Definitions
- the present invention relates to an antiskid control device which can efficiently operate the brake assembly of a motor vehicle without loss by slip, and, more particularly, to an antiskid control device which includes a program for detecting any malfunction of wheel speed sensors for the non-driven wheels.
- a prior art antiskid device is adapted to give a command to relieve the brake force when it detects that any one of the wheels is falling into a locking state.
- the command activates solenoids for pressure control valves in the wheel cylinder for the locking wheel to open and close the pressure control valves so that the pressure in the hydraulic circuit will drop.
- a brake pressure increase command is given to activate the solenoids to open and close the pressure control valves so that the hydraulic circuit will be connected to a hydraulic pressure source. The braking pressure thus begins to rise.
- the estimated vehicle speed is calculated from the speed of the faster one of the non-driven wheels or the average speed of the non-driven wheels.
- the non-driven wheels correspond to the rear wheels of a front wheel drive vehicle or the front wheels of a rear wheel drive vehicle.
- the antiskid control device will judge that the vehicle is at a stop even if it is actually moving, because no signals are supplied from the sensors for the non-driven wheels, thus executing the antiskid control on the basis of the wrong judgement.
- the wheel speeds detected by the sensors for the non-driven wheels are compared with a predetermined reference value to judge whether or not they are within an acceptable range. If they are out of the acceptable range and this state lasts over a predetermined period of time, it is judged that something is wrong with the wheel speed sensors or their circuits and an abnormality signal is issued. Thus, the antiskid control device according to the present invention will be less likely to make a misjudgement.
- FIG. 1 is an electric circuit diagram of the antiskid control device of the present invention
- FIG. 2 is a block diagram of the electronic control unit of the same
- FIG. 3 is a block diagram showing how the electronic control unit is related to the hydraulic circuit.
- FIG. 4 is a flow chart showing the logic of the wheel speed detector/judgement unit for the non-driven wheels shown in FIG. 3.
- the antiskid control device has an electronic control unit (hereinafter referred to as ECU). It performs logical operations and decisions on the basis of the signals from wheel speed sensors S1-S4, and activates solenoids SOL1-SOL6 for pressure control valves (not shown) in wheel cylinders for actuating the respective wheel brakes, and opens and closes a relay ML for a motor M for actuating a pump P in a hydraulic unit (not shown). As a result, the hydraulic pressure on the wheel cylinder for each wheel brake is increased, held or reduced.
- six solenoids SOL1-SOL6 are used to control the three hydraulic channels, one for the front right wheel, one front left wheel and one for the for both rear wheels, independently of one another.
- a watchdog circuit in the ECU detects any abnormality, it will turn on a warning lamp W1 and open a failsafe relay FL to disable the antiskid control, thus permitting ordinary brake control.
- the mark +B denotes a connection to a power source and the mark IG1 denotes a connection through an ignition switch to the power source.
- the output signals from the wheel speed sensors S1-S4, which are AC voltage signals, are converted into pulse signals in an interface circuit and the pulses are counted in a pulse processing circuit.
- a CPU then computes, analyzes and processes the values thus obtained and, on the basis of the results of operations, actuates the solenoids SOL1-SOL6 for the pressure control valves and the motor relay ML.
- the CPU also includes a program for determining the speeds of the non-driven wheels and turning on the warning lamp W1 according to their speeds.
- the CPU calculates the deceleration and the estimated vehicle speed on the basis of the wheel speed signals supplied from the wheel speed detector unit comprising the wheel speed sensors, an interface circuit, and a pulse processing circuit.
- a lock tendency detector unit in the CPU judges that a given wheel is showing a locking tendency if the deceleration drops below a predetermined value or if the slip speed (which is the difference between the estimated vehicle speed and the wheel speed) rises above a predetermined value, and gives a pressure reduction command to a solenoid actuating circuit.
- the solenoid actuating circuit energizes the solenoids SOL1 and SOL2 to move the pressure control valves 1 and 2 to the righthand side in the drawing, respectively.
- the hydraulic circuit of the wheel cylinder 4 will be cut off from a master cylinder 3 and be put into communication with a reservoir 5, so that the brake pressure will be reduced.
- the lock tendency detector unit will judge that the wheel has cleared out of the locking tendency and commands the solenoid actuating circuit to increase the brake pressure.
- the solenoid actuating circuit now deenergizes the solenoids SOL1 and SOL2 to allow the pressure control valves 1 and 2 to return to their original position shown in FIG. 3.
- the wheel cylinder 4 will be connected to the hydraulic pressure source, increasing the brake pressure.
- the solenoid SOL2 is deenergized while keeping the solenoid SOL1 energized.
- the presure control valve 1 will move to the righthand side of the drawing, shutting off the hydraulic circuit.
- the control valve 2 will remain in the original position. The hydraulic pressure in the wheel cylinder 4 is thus held constant.
- the above-described brake control may be carried out separately for each of the three channels, i.e. for the front right wheel, front left wheel and both rear wheels. Otherwise, the four wheels may be controlled separately from one another.
- To the processing and lock tendency detector unit is connected a unit for judging whether the speeds of the non-driven wheels have been within a predetermined range for a predetermined period of time.
- wheel speed sensors S1 and S2 are for the driven wheels and the sensors S3 and S4 are for the non-driven wheels.
- Step 1 the program is initialized, a counter is cleared, and the current wheel speeds Vw of the sensors S1 and S2 are temporarily set to the value of the wheel speeds in the previous cycle.
- Step 2 it is judged whether the wheel speeds detected by the sensors S1 and S2 are larger than a predetermined value. If not, the program proceeds to Step 3, which corresponds to the processing and locking tendency detector unit.
- Step 4 the current wheel speeds Vw from the sensors S1 and S2 are set to the wheel speeds in the previous cycle, and then returns to Step 2.
- Step 5 it is judged in Step 5 whether the current wheel speeds Vw from the sensors S1 and S2 are larger than a predetermined value which is the same value as the reference value used in Step 2 and which should be a relatively small value, e.g. 20 km/h.
- Steps 2, 4 and 5 it is judged in Steps 2, 4 and 5 whether or not the wheel speeds detected by the sensors S1 and S2 for the driving wheels are kept over the predetermined value consecutively.
- Step 6 it is judged whether the current wheel speeds Vw detected by the sensors S3 and S4 for the non-driving wheels are within a predetermined range, which includes zero and which may be 10 per cent of the current wheel speeds of the driven wheels detected by the sensors S1 and S2.
- Step 6 If judged NO in Step 6, the counter is incremented by one in Step 7. The value is compared with a reference value k in Step 8. If the antiskid control routine is repeated in a cycle of 8 milliseconds, the time during which the sensors S3 and S4 are supposed to be out of order is expressed by the content of the counter multiplied by 8 milliseconds.
- Step 8 If judged YES in Step 8, an abnormality signal is given which indicates that the sensors S3 and S4 are out of order (in Step 9). Then, the lamp W1 may be turned on, the failsafe relay FL may be closed to disable the antiskid control device, or other necessary measures may be taken. If judged NO in Step 8, the sensors S3 and S4 and their circuits are judged to be working normally and the program returns to Step 3.
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
Description
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63-29745 | 1988-02-10 | ||
JP63029745A JP2649681B2 (en) | 1988-02-10 | 1988-02-10 | Anti-skid device |
Publications (1)
Publication Number | Publication Date |
---|---|
US4955671A true US4955671A (en) | 1990-09-11 |
Family
ID=12284636
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/310,829 Expired - Lifetime US4955671A (en) | 1988-02-10 | 1989-02-08 | Antiskid control device |
Country Status (5)
Country | Link |
---|---|
US (1) | US4955671A (en) |
EP (1) | EP0328081B1 (en) |
JP (1) | JP2649681B2 (en) |
KR (1) | KR920008333B1 (en) |
DE (1) | DE68907353T2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4122484A1 (en) * | 1991-07-06 | 1993-01-07 | Teves Gmbh Alfred | CIRCUIT FOR DETECTING WHEEL SENSOR DEFECTS |
US5244257A (en) * | 1989-09-29 | 1993-09-14 | Robert Bosch Gmbh | Two-channel anti-lock brake system for a two-wheel motor vehicle |
US5277482A (en) * | 1988-12-14 | 1994-01-11 | Robert Bosch Gmbh | Antilock braking system |
US5671981A (en) * | 1995-04-20 | 1997-09-30 | Sumitomo Electric Industries, Ltd. | Sensor malfunction detecting system in vehicle control system |
US5868473A (en) * | 1995-04-18 | 1999-02-09 | Aisin Seiki Kabushiki Kaisha | Hydrulic braking pressure control system for an automotive vehicle |
US6364427B1 (en) * | 1999-05-25 | 2002-04-02 | Unisia Jecs Corporation | Automotive brake control system |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2649712B2 (en) * | 1988-10-22 | 1997-09-03 | 住友電気工業株式会社 | Anti-lock control device |
KR940002597B1 (en) * | 1989-01-14 | 1994-03-26 | 스미도모덴기고오교오 가부시기가이샤 | Antilock control device |
JPH03182868A (en) * | 1989-12-13 | 1991-08-08 | Sumitomo Electric Ind Ltd | Wheel speed control device |
US5290095A (en) * | 1991-06-13 | 1994-03-01 | Westinghouse Air Brake Company | Wheel lock detection arrangement for multiple-axle railway vehicles |
KR100353254B1 (en) * | 1998-05-30 | 2002-10-19 | 주식회사 만도 | Method for detecting error of anti-lock brake system |
KR100421659B1 (en) * | 2000-09-04 | 2004-03-10 | 주식회사 만도 | Method for verifying a wheel speed error in a vehicle brake system |
CN113147703A (en) * | 2021-05-28 | 2021-07-23 | 宝能(广州)汽车研究院有限公司 | Vehicle brake control method and storage medium |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2168866A (en) * | 1937-04-08 | 1939-08-08 | Gehl John | Snow-removing device |
US3709567A (en) * | 1971-03-26 | 1973-01-09 | Gen Motors Corp | Adaptive control anti-lock brake system |
US3920284A (en) * | 1974-05-10 | 1975-11-18 | Eaton Corp | Monitoring circuitry for a skid control system |
US3920280A (en) * | 1973-08-10 | 1975-11-18 | Wabco Westinghouse Gmbh | Antiskid brake control system having malfunction protection |
US4546437A (en) * | 1982-09-18 | 1985-10-08 | Itt Industries, Inc. | Method and circuit for the control of a brake slip control apparatus |
US4701854A (en) * | 1984-02-13 | 1987-10-20 | Nissan Motor Company, Limited | Method and system for performing fail-safe operation for anti-skid automotive brake control system having a plurality of controllers independently operable to others |
US4814990A (en) * | 1985-03-13 | 1989-03-21 | Zahnraderfabrik Renk Ag | Control circuit for motor vehicles |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2546481C2 (en) * | 1975-10-17 | 1986-03-06 | Robert Bosch Gmbh, 7000 Stuttgart | Monitoring circuit for at least two transducers |
JPS6038249A (en) * | 1983-08-11 | 1985-02-27 | Nissan Motor Co Ltd | Abnormality detecting device in speed controller for vehicle |
JPS60128056A (en) * | 1983-12-13 | 1985-07-08 | Nissan Motor Co Ltd | Monitor device in antiskid control system |
JPS61193961A (en) * | 1985-02-25 | 1986-08-28 | Nippon Denso Co Ltd | Trouble detector for engine speed sensor |
DE3537452C2 (en) * | 1985-10-22 | 1996-06-13 | Bosch Gmbh Robert | Traction control system |
JPH0637166B2 (en) * | 1985-12-10 | 1994-05-18 | 株式会社曙ブレ−キ中央技術研究所 | Driving force control device for self-propelled vehicle |
-
1988
- 1988-02-10 JP JP63029745A patent/JP2649681B2/en not_active Expired - Lifetime
-
1989
- 1989-02-08 US US07/310,829 patent/US4955671A/en not_active Expired - Lifetime
- 1989-02-08 DE DE89102170T patent/DE68907353T2/en not_active Expired - Lifetime
- 1989-02-08 EP EP89102170A patent/EP0328081B1/en not_active Expired - Lifetime
- 1989-02-08 KR KR1019890001421A patent/KR920008333B1/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2168866A (en) * | 1937-04-08 | 1939-08-08 | Gehl John | Snow-removing device |
US3709567A (en) * | 1971-03-26 | 1973-01-09 | Gen Motors Corp | Adaptive control anti-lock brake system |
US3920280A (en) * | 1973-08-10 | 1975-11-18 | Wabco Westinghouse Gmbh | Antiskid brake control system having malfunction protection |
US3920284A (en) * | 1974-05-10 | 1975-11-18 | Eaton Corp | Monitoring circuitry for a skid control system |
US4546437A (en) * | 1982-09-18 | 1985-10-08 | Itt Industries, Inc. | Method and circuit for the control of a brake slip control apparatus |
US4701854A (en) * | 1984-02-13 | 1987-10-20 | Nissan Motor Company, Limited | Method and system for performing fail-safe operation for anti-skid automotive brake control system having a plurality of controllers independently operable to others |
US4814990A (en) * | 1985-03-13 | 1989-03-21 | Zahnraderfabrik Renk Ag | Control circuit for motor vehicles |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5277482A (en) * | 1988-12-14 | 1994-01-11 | Robert Bosch Gmbh | Antilock braking system |
US5244257A (en) * | 1989-09-29 | 1993-09-14 | Robert Bosch Gmbh | Two-channel anti-lock brake system for a two-wheel motor vehicle |
DE4122484A1 (en) * | 1991-07-06 | 1993-01-07 | Teves Gmbh Alfred | CIRCUIT FOR DETECTING WHEEL SENSOR DEFECTS |
US5476311A (en) * | 1991-07-06 | 1995-12-19 | Itt Automotive Europe Gmbh | Circuit configuration for detecting wheel sensor malfunctions |
US5551768A (en) * | 1991-07-06 | 1996-09-03 | Itt Automotive Europe Gmbh | Circuit configuration for dectecting wheel sensor malfunctions |
US5562327A (en) * | 1991-07-06 | 1996-10-08 | Itt Automotive Europe Gmbh | Circuit configuration for detecting wheel sensor malfunctions |
US5868473A (en) * | 1995-04-18 | 1999-02-09 | Aisin Seiki Kabushiki Kaisha | Hydrulic braking pressure control system for an automotive vehicle |
US5671981A (en) * | 1995-04-20 | 1997-09-30 | Sumitomo Electric Industries, Ltd. | Sensor malfunction detecting system in vehicle control system |
US6364427B1 (en) * | 1999-05-25 | 2002-04-02 | Unisia Jecs Corporation | Automotive brake control system |
Also Published As
Publication number | Publication date |
---|---|
EP0328081A3 (en) | 1990-11-28 |
KR920008333B1 (en) | 1992-09-26 |
JPH01204859A (en) | 1989-08-17 |
DE68907353T2 (en) | 1993-12-23 |
EP0328081B1 (en) | 1993-06-30 |
EP0328081A2 (en) | 1989-08-16 |
DE68907353D1 (en) | 1993-08-05 |
KR890012845A (en) | 1989-09-19 |
JP2649681B2 (en) | 1997-09-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SUMITOMO ELECTRIC INDUSTRIES, LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HIGASHIMURA, HIDEAKI;REEL/FRAME:005040/0007 Effective date: 19890131 |
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STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
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FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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FPAY | Fee payment |
Year of fee payment: 4 |
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FPAY | Fee payment |
Year of fee payment: 8 |
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FPAY | Fee payment |
Year of fee payment: 12 |
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AS | Assignment |
Owner name: ADVICS CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUMITOMO ELECTRIC INDUSTRIES, LTD.;REEL/FRAME:020817/0585 Effective date: 20080228 |